Sickle-billed Vanga Falculea palliata


Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2022 Least Concern
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency Medium
Land mass type Average mass -

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 595,000
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals unknown not applicable not applicable 0
Population trend Decreasing suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 10-19 - - -
Decline (10 years/3 generation past and future) 10-19 - - -
Number of subpopulations - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 3.85 - - -

Population justification: The global population size has not been quantified, but the species is described as fairly common in western and southwestern Madagascar (Morris and Hawkins 1998, Eguchi et al. 2001).

Trend justification: This species is suspected to be declining as a result of habitat loss and degradation. The species' range lost 18% of forest cover over the past three generations (11.55 years), and tree cover loss has been accelerating since 2016 to a rate equivalent to 23% (Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). As the species prefers relatively open habitats, forest cover loss alone is unlikely to drive a rapid population decline and therefore, the rate of decline over the past three generations is tentatively placed in the band 10-19%.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Madagascar N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Madagascar Analamerana Special Reserve
Madagascar Ankarana Special Reserve
Madagascar Andavakoera Classified Forest NAP
Madagascar Lake Sahaka - Analabe NPA and extension
Madagascar Ambavanankarana wetland
Madagascar Daraina Forest
Madagascar Manongarivo Special Reserve and extension
Madagascar Port-Bergé Wetlands NPA and extension
Madagascar Mahavavy - Kinkony wetlands NPA
Madagascar Baly Bay National Park
Madagascar Ankarafantsika National Park and Ampijoroa
Madagascar Cap Saint André forest and wetlands
Madagascar Tsingy de Namoroka National Park
Madagascar Maningoza Special Reserve
Madagascar Bemarivo Special Reserve
Madagascar Kasijy Special Reserve
Madagascar Tambohorano Wetland NPA
Madagascar Tsingy de Bemaraha National Park and Strict Nature Reserve
Madagascar Bemamba Wetland Complex
Madagascar Manambolomaty wetland complex and Tsimembo Classified Forest
Madagascar Wetlands of the Tsiribihina delta and upper Tsiribihina river
Madagascar Menabe forest complex
Madagascar Kirindy Mite National Park and extension
Madagascar Lake Ihotry - Mangoky Delta Complex NPA
Madagascar Mangoky-Ankazoabo Complex NPA
Madagascar Mikea
Madagascar Zombitse-Vohibasia National Park and extension
Madagascar Saint Augustin Forest
Madagascar Beza Mahafaly Special Reserve
Madagascar Tsimanampetsotsa National Park
Madagascar Mahafaly Plateau Forest complex
Madagascar Andohahela National Park - Section II
Madagascar Mangoky-Ankazoabo Complex NPA
Madagascar Kirindy-South Forest
Madagascar Kirindy Mitea National Park

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Dry major resident
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable resident
Forest Subtropical/Tropical Moist Lowland suitable resident
Savanna Dry major resident
Shrubland Subtropical/Tropical Dry major resident
Altitude 0 - 900 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Scale Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2022) Species factsheet: Falculea palliata. Downloaded from on 17/08/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from on 17/08/2022.